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A033998
Numbers n such that the sum of the primes <= n is a square.
+0
4
23, 22073, 67187, 79427, 10729219, 3531577135439
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Maintained by
N. J. A. Sloane
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
AT&T Labs Research
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